唱歌時(shí)，人們常常說這個(gè)歌曲是C調(diào)，那個(gè)歌曲是D調(diào)。但是你知道曲調(diào)是由什么決定的嗎?原來(lái)。音調(diào)是曲聲源的振動(dòng)頻率決定的。聲源的振動(dòng)頻率越大，音調(diào)越高;振動(dòng)頻率越小，音調(diào)越低。不同曲調(diào)的第一個(gè)音1(do)...2013-01-19

我們剛才談的現(xiàn)象是物理學(xué)家多普勒發(fā)現(xiàn)的，所以這個(gè)現(xiàn)象就和他的名字連在一起。這種現(xiàn)象不但可以在聲音方面看到，在光的現(xiàn)象上也可以看到，因?yàn)楣夂吐暥际怯貌ǖ男问絺鞑サ?。波的次?shù)增多(在聲波方面，使我...2013-01-19

Unit12 My favorite subject is science. 初中英語(yǔ)七年級(jí)句型： Whats your favorite subject? My favorite subject is math. Whats his favorite subject? His favorite subject is art. Whats he...2013-01-19

Unit11 What time do you go to school? 初中英語(yǔ)七年級(jí)句型： What time do you usually get up? I usually get up at five oclock. What time does he eat breakfast? He eats breakfast at seve...2013-01-19

Unit10 Can you play the guitar? 初中英語(yǔ)七年級(jí)句型： Can you dance? Yes, I can./No, I cant. Can he paint? Yes, he can./ No, he cant. Can she speak English? Yes, she can./No, she cant....2013-01-19

Unit9 Do you want to go to a movie? 初中英語(yǔ)七年級(jí)句型： Do you want to go to a movie? Yes, I do./ No, I dont. Does he want to go to a movie? Yes, he does./No, he doesnt. What kind of...2013-01-19

Unit8 When is your birthday? 初中英語(yǔ)七年級(jí)句型： When is your birthday? My birthday is November 11th. When is Liu Pings birthday? Her birthday is on September 5th. When is his birthd...2013-01-19

Unit7 How much are these pants? 初中英語(yǔ)七年級(jí)句型： 必須掌握的中考英語(yǔ)考點(diǎn)： How much is the red sweater? Its eight dollars. Whats the price of the red sweater? Its eight dollars. How...2013-01-19

Unit6 Do you like bananas? 短語(yǔ)句型：總結(jié)了初中英語(yǔ)教學(xué),初中英語(yǔ)單詞,初中英語(yǔ)作文,初中英語(yǔ)輔導(dǎo)中務(wù)必掌握的英語(yǔ)考點(diǎn)。 1, like+ sth/sb like to do sth like doing sth 2, 請(qǐng)吃蔬菜和水果 Please...2013-01-19

Unit5. Do you have a soccer ball? 短語(yǔ)句型：總結(jié)了初中英語(yǔ)教學(xué),初中英語(yǔ)單詞,初中英語(yǔ)作文,初中英語(yǔ)輔導(dǎo)中務(wù)必掌握的英語(yǔ)考點(diǎn)。 1, Lets play soccer. =Let us play soccer Let me help you. let ...2013-01-19